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"GUYS WHERE ARE YOU ITS BEEN A MONTH - R U OKAY???," wrote one follower.

Another said: "You guys ok? It's been a while!"

Their comments were met with no response except from someone who posted early Thursday morning with the news.

The pair quit their jobs left Perth in July 2017 in a Toyota LandCruiser bound for the UK, planning to travel for two years driving across 36 countries.

"Our biggest motivation behind making the vlogs is to hopefully inspire anyone wanting to travel, and also try to break the stigma around travelling to countries which get a bad wrap (sic) in the media," they said in a post on crowd-funding platform Patreon.

Another British-Australian woman, an academic lecturing at a university in Australia who studied at Cambridge University, has also been detained in Evin jail.

The federal government confirmed the reports to news.com.au yesterday.

"(DFAT) is providing consular assistance to the families of three Australians detained in Iran," a DFAT spokesman said.